Device for indicating the movements to be executed by machine tools



Nov. 15, 1949 PEGARD 2,488,324

DEVICE FOR INDICATING THE MOVEMENTS TO BE EXECUTED BY MACHINE TOOLSFiled D90. 6, 1945 9 Sheets-Sheet 1 QQMM NOV. 15, 1949 PEGARD 2,488,324

E FOR INDICATING THE MOVEME DEVIC TO BE EXECUTED BY MACHINE TOOL FiledDec. 6, 1945 9 Sheets-Sheet 2 Nov. 15, 1949 M. PEGARD 2,488,324

DEVICE FOR INDICATING THE MOVEMENTS TO BE EXECUTED BY MACHINE TOOLSFiled Dec. 6, 1945 9 Sheets-Sheet 3 Nov. 15, 1949 M. PEGARD DEVICE FORINDICATING THE MOVEMENTS TO BE EXECUTED BY MACHINE TOOLS 9 Sheets-Sheet4 Filed Dec. 6, 1945 1949 M PEGARD 2,483,324

DEVICE FOR INiDICATING THE MOVEMENTS TO BE EXECUTED BY MACHINE TOOLSFiled Dec. 6, 1945 9 Sheets-Sheet 5 v k j I) D D Nov. 15, 1949 M. PEGARD2,488,324

DEVICE FOR INDICATING THE MOVEMENTS TO BE EXECUTED BY MACHINE TOOLSFiled Dec. 6, 1945 9 Sheets-Sheet 6 Nov. 15, 1949 M. PEG D 2,488,324

DEVICE FOR I CATI MOVEME 7 TO BE EXEC D BY MA NE TOOL Filed Dec. 6, 19459 Sheets-Sheet 7 Fig.7

Nov. 15, 1949 M. PEGARD 2,488,324

DEVICE FOR INDICATING THE MOVEMENTS TO BE EXECUTED BY MACHINE TOOLSFiled Dec. 6, 1945 9 Sheets-Sheet 8 Nov. 15, 1949 M. PEGARD 2,488,324

DEVICE FOR INDICATING THE MOVEMENTS TO BE EXECUTED BY MACHINE TOOLSFiled Dec. 6, 1945 9 Sheets-Sheet 9 Patented Nov. 15, 1949 UNITED STATESPATENT OFFICE DEVICE. FOR INDICATING THE MOVEMENTS TO BE EXECUTED BYMACHINE TOOLS Marcel Pgard, Paris, France Section 1, Public Law 690,August 8, 1946 Patent expires January 24, 1962 9 Claims. (01. 177-311)In machine-tools, there exist a certain number of parts or groups ofparts which are adapted to move either in one direction or in oppositedirections for producing the required advance motions. For instance in aboring machine, the socalled straggler carriage may assume a horizontaldisplacement over the slideway of the frame; the plate intended toreceive the work may assume a horizonal displacement perpendicular tothe preceding movement with reference to the straggler; thespindle-carrying carriage may move vertically. The spindle may slide inparallelism with its own axis along this carriage.

These different movements are controlled by means of control levers orflywheels and are transmitted to the parts considered by suitabletransmissions actuated by a supply of driving power.

It is very difiicult for the operator of the machine to ascertainexactly the nature of the movements which should be executed at anymoment according to the position given to the control parts at themoment considered. As a matter of fact, it is necessary to take intoaccount not only these positions but also other data such for instanceas the direction of rotation of the motor.

My invention has for its object to remove this difliculty and it coversto this end a luminous signalling device allowing the operator of themachine to ascertain at every moment the direction of the movementsproduced.

This device consists in principle in a board on which is drawn a diagramof the machine, for instance the boring machine; the" parts capable ofmoving are shown on it and to each of them corresponds a transparentarrow giving out the directions of displacement. Behind said arrows arelocated electric bulbs, the illumination and extinction of which aredetermined by the movements of the control parts.

The boring machines, and generally the machine-tools to which theinvention is applicable, are provided with a surfacing plate, i. c. witha circular plate carried: concentrically with a tool such. as a spindleand provided with a slide carrying a tool which slide assumes a radialmovement with reference to the axis of the spindle so as to make thetool draw a spiral on the surface worked upon and rectify thissurface.

According. to my invention two special luminous arrows are adapted togive out the direction of displacement of the surfacing slide. Behindthese arrows are placed corresponding lamps which are lit: orextinguished at the required moment.

In. the same case of machines with a surfacing plate, it is useful inorder to avoid any faulty operation to provide a signal warning theoperator that the slide and the spindle are both operative as itmight'occur that at the end of the stroke the tool carried by the slidemay meet the spindle which would damage both parts. To this end I add tothe indicating board, a lamp which has for its object to warn of anyrisk of meeting between the spindle and. the slide on the plate. Thislamp is lit under the action of a novel device comprising twolongitudinal grooves provided on the sheath of the spindle and engagingprojections adapted to actuate contacts when they reach one end of thecorresponding groove. One of these contacts sends current into the lastmentioned lamp for warning of the danger of meeting between the spindleand the slide on the plate. The other contact breaks the current feedingthe motor if the limits of displacement of the spindle in one directionor the other are reached.

Beyond this general principle, the invention shows different featureswhich will appear from Fig, 5 shows separately the diagram of theelectric connections.

Fig. 6 shows a modification corresponding to the case of machineprovided with a surfacing plate.

Fig. 7 shows the indicating board in said modification.

Fig. 8 a corresponding general diagrammatic view showing the connectionof the electric parts withthe mechanical parts.

Fig. 9 is a simplified wiring diagram.

Referring to Fig. 1, T designates the straggler.

adapted to move horizontally over the slideways G of the frame and P thework-carrying table adapted to assume a horizontal movementperpendicular to that of the straggler.

The tool is placed in the spindle holder B carried by the spindle-holdercarriage 0 adapted to assume a vertical movement along the slideways H.

The indicating board Ti forming the object of the invention is mountedon the spindle-holder carriage C. Next to it lies an indictor 10controlling the cutting speeds.

At M is located the electric motor actuating the tool, said motorserving also for actuating the different mechanical parts.

b designates the change speed levers of the spindle; in the drawing areshown two levers actuating several sliding gears B1, B2, B3, B4 (Fig. 4)providing the various possible speeds of the spindle.

c (Fig. l) designates the levers for adjusting the advance motions, i.e. those which provide for modifications in the magnitude of any one ofthe advance motions.

d is the change speed and advance motion lever; it allows reducing thespeed of the spindle and increasing the advance motion and con versely,increasing the speed of the spindle and decreasing the advance motion.

6 (Figs. 1, 3 and 4) is the lever for selecting the advance motion;according to its position, either the spindle holder B is displaced bymeans of the rack LB (Fig. 3) or else the box BE is started by means ofthe rod A12 or again if required the slide of the surfacing plate isdisplaced by means of the gear E39.

The selection of the longitudinal displacement movement of thestraggler, of the transversal motion of the table and of the verticalmotion of the spindle holder carriage is performed by means of the gearwheels contained in the box BE (Fig. 3) arranged on the bench. Thecontrol is obtained by means of a single part A12 passing out of thespindle-holder carriage.

,f (Figs. 1, 3 and 4) designates the advancereversing lever whichthrough its transmission Pf may reverse the direction of movement of allthe worms and consequently of the advances.

g (Fig. 1) is the selecting lever for the advances, which allowsobtaining slow or rapid advances or hand operated advances.

7 (Figs. 1 and 3) designates the cross bar for engaging and operatingthe spindle, i. e. engages the latter directly and controls the handoperated advance.

1) (Figs. 1, 3 and 4) is the selecting device for the parts to bedisplaced. It acts on the part contained in the box BE. If it is raised,it lowers through the agency of the lever PL a sliding gear Bs (Fig. 3),which actuates the worm LV. If it is horizontally displaced, it drivesthrough an arm bp a sliding gear B which actuates the worm LL for thelongitudinal displacement of the straggler or the worm LT for thetransversal displacement of the table.

Referring to the detailed View showing the indicating board (Fig. 2) itis apparent that on its front side, is drawn a sketch illustratingdiagrammatically the machine. The principal clements given outhereinabove appear in said sketch. To each movable part correspond twotransparent arrows LB, LB-LT, L'TLV, L'V having opposite directions. Adiagonal line A subdivides the diagram into two parts; the arrows abovethis line give out the movements which set the parts further from theoperator and the arrow underneath the movements nearing them.

At the lower part of the board are located three knobs l, I and 2; thetwo former serve for controlling the passage of current into the motorfor making it rotate in either direction; the two 4 arrows 1 and I showthrough their illumination the direction of operation. The third knob 2controls the stopping.

The knobs l and I when they are depressed close the circuit of therelays shown at AV and AR in the diagram of Fig. 5; when one of theserelays receives current, its armature illustrated diagrammatically bythe dot and dash line L displaces the row of usual movable correspondingcontacts 4a, 4b, 4c, and M which close difierent circuits as will beseen hereinafter. It closes also a complementary contact 5 or 5 arrangedin the circuit of a transformer 6 feeding the indicating lamps 1 or I.

The general diagrams of Fig. 3 and Fig. 4 show how the levers describedhereinabove act on the electric circuit producing the illumination ofthe lamps of the indicating board; they show also the kinematicconnection between said levers, the power supply and the partscontrolled through their agency.

The lever e shows a part cc (Fig. 4:) forming a cam acting on adepressable element of a contact CB inserted in the circuit of the lampsLB, LB corresponding to the spindle.

The lever acts in a similar manner through a cam fc (Fig. 4) on thecontacts Co and Cc, one of said contacts being adapted to be opened andthe other closed according to the desired series of displacements.

The lever 9 (see Fig. 1) may be brought into three different positionsthrough horizontal displacements thereof. In each of said positions, ifit is lowered vertically, it switches the current ed the motor by actingon the contact CS (Fig. 5).

The lever p which may assume a double movement, as appears clearly inthe general diagram, produces the following effects: When this lever isat its dead point, all the kinds of movements which are signalled on oneside of the diagonal are possible and all the arrows are illuminated.But if this lever has been placed in a selection position only thecorresponding arrow remains illuminated.

When this lever :0 receives an elevational movement, it acts through aslope Rp and a roller (Fig. 4) on a contact CV. If a horizontal movementis imparted to it, it acts through a cam Cp on the contacts CL, and CT.The location of these contacts in the electric circuits appears moreclearly in Fig. 5.

The control system a (Figs. 3 and 4) acts through a cam K7 on a contactC9 controlling the lamp LE.

The operation is as follows;

The first step consists in acting on either of the knob I or I, whichsends current into one of the relays AV or AR. The latter closes itscontacts, consequently the motor M is started in either directionaccording to the knob actuated. For example, if the knob is acted uponthe circuit of relay AV is established from the input lead I02 throughwire I M, winding AV, wire I05, the switch controlled by knob I, wireI06, closed switch CS and line wire IUI.

At the same time, the transformer 5 receives current and it feeds eitherof the two lamps LAV 01' LAR of the corresponding arrows l or I. Theilluminated arrow indicates the direction of rotation of the motor.

The second step consists in placing the lever f in a positioncorresponding to the direction of the desired displacement of the partwhich is to assume a movement, which part may be the carriage,spin'dlezor the like. According tov the position given to this llever .7.all the lamps LL, LV, LB (Fig. 5) or all the lamps LL, L'T,T;T -iV, LBare illuminated :i. e. :all the lamps above the diagonal or all thoseunderneath. For instance, if "by the action iof lever f,;switch Cc hasbeen closed, the :icurrent will :fiQW from transformer 6 through-wires11', M8, contact 5, switch Cc, lamps LV., L l, ".LL, wires H39, M0, 11l,, H2, closed switches CB, CV, CL,-CT.

.At the .same time, .the lever J has by its adjustment and through:means of the vprojection In *(Fig. 4) paused the sliding :gear B10 tomesh either with the pinion E10 mounted directly on the shaft passingout of the box controlling the variations in the magnitude of theadvance motion @or with the pinion E12 which actuates E10 throughtheagency of E11 .so as to produce areversal vof motion. Therefore,according to the position of the sliding gear B10, the shaft A10 rotatesin the corresponding direction and this shaft will control one .of the.parts to be displaced.

The operator settles then the part to be displaced, a carriage (one ofthe three carriages of the diagram) orspindle vor plate if the machinecomprises .such .a .part and he displaces consequently 'the lever e(third operation) for bringing itin front of the required indicationcarried by an indicating plate .arranged in .front of sa'idlever.

Said lever e as it actson the contact ,piece CB providesior theillumination of the lamp LB .or IIB corresponding to either direction ofoperation of the spindle B when the lever considered is called to act onsaid spindle or else, when it acts on one of the three other members .ofthe machine considered, such .as one of the three carriages, said levereprovides for the illumination of either of the lamps IL, or IJ'L, 'L'Ior LT, LV -or UV corresponding to the direction of displacement .of -thepart considered.

Through the vfinger 2.9, it displaces the sliding ,gear lEzo mounted onthe shaft A10 which actuates one of the following gearwheelsz E21 whichdrives thespindle through the rack LB by means of "the clutch of thecross-barKfi or E22 which drives the group of carriages through theagency of the shafts A11 and A12 and the gears EB contained "inth'e boxBE for selection in the frameyor'else'the pinionE23 which drives through'the shaft A14 the slide of the plate.

The "fourth operative step is subdivided into two according as towhether it 'is desired to produce the displacement of the spindle orthat of the carriages. If the spindle .is to receive the movement. thecross-bar is engaged so as to produce the closing of switch C7 andtheillumination of the lamp LE. In this case lever E will have beenoperatedso as to act upon switch "CB breaking contact between contact members 121 and I 22 thereby cutting off previously lighted lamps LL, LT. LV (LL,LT. L'V') which 'are thus extinguished, and establishing contact betweencontact members I23 and 124 thereby allowing current to continue to-pass through lamp LB (LB) and thereby allowing this lamp to remainlighted. In the .case of a carriage, the operator should then act on thelever 10. As the vertical "movement of the lever actuates the .spindleholder carriage as described 'hereinabove, it is necessary to give thelever p ahorizontal displacement to one side or another. This movementextinguishes two luminous arrows as shown with reference to'Fi'gsd'and5. 'There remains only one arrow of the series 'LL, "LT, 'LV (L'L 1;?1,L'V) illuminated which corresponds to the part to ibfi displaced,.straggler or carriage. In this case, 218516! E will have been soactuated as to break the connection between contact members i623 :and124, thus extinguishing lamp LB (LfB) and to close the contactmembers HIand [12 2.

There remains only to .be determined the .nature :of the advances ;i..e. advance by hand,,slow. or rapid advance.

.To this :end, the operator actuates the lever -g (fifth step) (-Fig.'1) for driving the double sliding gear B30 (Figs. 3 'and 4).

.If :the sliding gear is displaced towards the left (Fig. 3.1) :so as toengage the pinion E30 with the pinion E31 the advance is controlled ,bythe slow speed motor through the agency of the pinionsEas, E35, E34,E33, E31, E30.

If -.it is displaced towards the right for .engaging the pinion E32 withE33, one obtains the rapid advance controlled by the motor through E36,E35, E34, E33, E32.

Lastly if it is displaced toward the left so as to make E30 mesh withE32, one obtains a hand operated advance. The latter is produced bymeans of the hand wheel 2 acting on E37 through the agency of the bevelpinions E32.

From the above disclosure, .:it is apparent that any movement of acontrol lever has not only for result a mechanical control, but also :atthe same time, as action on the electric circuits in which are insertedthe signalling lamps whereby at each moment the latter give out theselection which has been performed. The indicating board Ti shows theresults already obtained by the operation executed and also theoperations which remain possible.

In the case illustrated in Fig. 6, the machine is supposed to beprovided with a surfacing plate PS comprising a slide CS.

Referring to Fig. '7 illustrating the corresponding luminous indicatingboard, it is apparent that the latter comprises the same arrangement asin the preceding form of execution with the i addition of two furtherarrows LS and US arranged on either side of the diagonal line 6 andindicating the direction of displacement of the surfacing slide.

These arrows LS, US are illuminated through two lamps LP and L? whichare illustrated in the wiring diagram (Fig. 9), which is similar to thatof the preceding case. These lamps are controlled .b two switches CLPand CLPB actuated in their turn by the lever e borne by the carriage Cfor selecting the advance motion (third operative step).

The lever c has been modified as shown in Fig. 8 for controlling the twoabove supplementary lamps. It may assume four positions. Three of thesepositions are the same as in thepreceding case i. e. one of themcorresponds to the displacement of the tool carrying spindle B by meansof the rack LB, (Fig.8) while the second produces the movement of thebox BE through the rod A12 and the third is that which produces thedisplacement of the surfacing slide by means of the gearwheel E39. Thefourth position corresponds to the simultaneous operation of the spindleand of the slide which is obtained by simultaneously engaging thesliding gear E20 with the pinion E21 controllin the spindle and with thepinion E23 controlling the shaft A14 and the gearwheel E39.

In Fig. 8.,it is apparent that the lever e in its,

diiferent positions acts on different contacts. It carries on itspivotal axis .a sort of plate provided at its periphery with bossesadapted to act on thrust members controlling the contacts. One of thesebosses ec acts first on the thrust member of a contact CLPB which, whenthe lever e occupies the position for which the spindle B moves,establishes a circuit lighting the lamp LB or the lamp L'B. By pushingfurther this lever c until it enters the position in which it controlssimultaneously the progression of the spindle and the progression of theplate to be surfaced, a boss cc acts on the contact CLP and closes it,the boss ec continuing to hold the contact CLPB closed. The contactsCLPB, CLP and CLTP of Fig. 9 being closed, the lamp LB or L'B is lit atthe same time as LP or LP which reveals the simultaneous progression ofthe spindle and of the plate.

Another boss e acts on the thrust member controlling a contact CLVTinserted in the circuit of the lamps LL, LL, LT, L'T, LV, LV, which giveout respectively the movement of the straggler, of the table or of thevertically moving carriage.

Lastly the boss e0 may act only on the contact CLP inserted in thecircuit of the lamps LP and LP indicating the progression of the platealone when the latter is operative, without the spindle being caused toadvance.

The lever f for reversing the advances (second operative step) isprovided with two bosses f f by means of which it acts on the contactsCSA or USA which lights the lamps above the diagonal or the lampsunderneath same.

The lever p which is the lever for selecting the parts to be displacedwhether straggler, table or carriage (fourth operative step) ismanipulated as in the case of Figs. 1 to 5. When it is at its deadpoint, I may obtain the longitudinal movement of the straggler, thetransversal movement of the table or the vertical movement of thecarriage. In this position, all the corresponding arrows areilluminated, but if it is placed in a selecting position, onl thecorresponding arrow remains illuminated. The contact on which it actswhen raised is shown at CLV (Figs. 8 and 9). When it is displacedhorizontally, it acts on the contacts CLL and CLT (Figs. 8 and 9).

The lamp LE of the preceding case is omitted. But a lamp LTP is added(Fig. 8) in the case of machines with a surfacing plate. This lamp whichis of a very apparent colour, for instance red, is illuminated when theslide of the surfacing plate is actuated and the spindle is sufficientlyout for it to be possible for the spindle to contact with the slide,which it is necessary to avoid.

The illumination of the lamp LTP is produced in the following manner;the sheath of the spindle shows two grooves rl r2 inside which areengaged projections dl d2. The groove rl is provided at one end with asloping guideway r I.

When the spindle is pushed back home, the projection dl is urged back bythe sloping guideway r! of the groove so as to actuate a contact CLTP;in this position, the lamp LTP is not lit. If the spindle advancessufliciently for there to be a risk of meeting the slide, the projectiondl engages the groove Ti and actuates the contact CLTP which illuminatesthe lamp LTP.

The other groove T2 is not open at its ends; when the projection d2reaches either of its ends during an exaggerated displacement of thespindle, this projection actuates the contact CSB which opens thecircuit of the motor (Fig. 9).

The lever g (fifth operative step) which determines the nature of theadvances may as before cut the current of the motor in each of itspositions by acting on a contact CF which is shown in Fig. 9.

The operation of the system thus modified is as follows:

The first operation consists in acting on one of the knobs I or I (Fig.9) which starts the motor in either direction as in the preceding case:the corresponding lamp LAV or LAR is lit.

The second operative step consists in operating the lever the positionof which determines the direction of the movements of the part to bedisplaced. This lever acts on the contacts CSAI or CSA2 and lights thelamps LL, LT, LV, or LB, LP or else the lamps LL, L'T, LV, or LB, LP,according to the position of the lever e.

I actuate then the lever e for selecting the advances (third operativestep) which, as described herein above may assume four positionsaccording as to whether I wish to displace the spindle B or else one ofthe three parts controlled by the mechanism of the box BE 1. e.straggler T, or table P or vertical carriage C or else the spindle aloneor the slide of the surfacing plate or lastly together both the spindleand the slide of the plate.

This lever acts on the contacts CLP, CLVT and CLPB; there remains onlythen as lighted lamps one of the lamps LB, L'B or else the two lamps LBand LP or L'B, LP or else the three lamps LL, LT, LV or LL, L'T, L'V.

The fourth lever, i. e. the selection lever 12 carried by the frame actson the contacts CLL; CLT, CLV, and leaves as the only lit lamp thatcorresponding to the straggler T or to the table P or to the carriage C.

It will be noticed on the diagram of Fig. 9 that when the lever 6 (thirdlever) is in the position required for the movement of the plate alone,and the spindle is out without advancing, the contact CLPB is open whileCLP and CLTV are closed; the lamp of the plate LP or LP is lit togetherwith the safety lamp LTP because there cannot be any meeting between theslide and the spindle when out.

If, on the contrary, the spindle is withdrawn, the contact CLTP is openand the lamp LTP is extinguished.

As apparent from the preceding, all the possible operations of the partsare signalled at each moment and the supplementary safety lamp warns theoperator of the risk of the slide tool meeting the spindle.

Although the invention has been described with reference to a boringmachine, it should be well understood that it is applicable in a generalmanner to all machine-tools.

What I claim is:

1. In a machine tool of the type described, a luminous board carried bythe machine itself and carrying a diagrammatic illustration of themachine, arrows located on the board near the illustration of themovable members of the machine, means for selecting the members of themachine to be operated and for illuminating said arrows, means foroperating said members, an electric motor, an electric circuit forcontrolling the operation of said motor, two control knobs adapted toact on said electric circuit for starting the motor in either direction,two of the arrows on the board corresponding to the two pos sibledirections of operation of the motor and means for illuminating saidlast-mentioned arrows selectively according to the circuit controllingknob that is actuated, and a control part for operatively connectingsaid electric motor to said .9 means for operating said members, aftersaid mtor has been started and after said' members have been selectedfor operation: by said selecting means.

2. In a. machine tool of the, type described, a luminous board carriedby the machine itself and carrying a diagrammatic illustration of themachine, arrows located on the board near the illustration of themovable members of the machine, means for selecting the members oi themachine to be operated and for illuminating said arrows, means foroperating said members, an electric motor, an electric circuit forcontrolling the operation of said motor, two control knobs adapted toact on said electric circuit for starting the motor in either direction,two of the arrows on the board corresponding to the two possibledirections of operation of the motor, a relay for each control knobincluding a contact, illuminating means for said last-mentioned arrows,an electric circuit for controlling said last-mentioned means, meanswhereby each relay contact is adapted to connect said last-mentionedcircuit with the corresponding arrow illuminating means, and a controlpart for operatively connecting said electric motor to said means foroperating said members after said motor has been started and after saidmembers have been selected for operation by said selecting means.

3. In a machine tool of the type described, a luminous board carried bythe machine itself and carrying a diagrammatic illustration of themachine, arrows located on the board near the illustration of themovable members of the machine, means for illuminating said arrows,selecting levers for selecting a movable member which it is desired tooperate, means for operating said member after it has been so selected,means controlled by said levers for actuating the means illuminating thearrows corresponding to the selected member, and a control part forrendering effective the means for operating said selected member afterthe selecting levers have been operated to select said member and aftersaid levers have operated the means for actuating the illuminatingmeans.

4. In a machine tool of the type described, a luminous board carried bythe machine itself and carrying a diagrammatic illustration of themachine, arrows located on the board near the illustration of themovable members of the machine, means for illuminating said arrows,selecting levers for mechanically selecting a movable member which it isdesired to operate, means for operating said member after it has been soselected, means controlled by said levers for actuating the meansilluminating the arrows corresponding to the selected member, and acontrol part for rendering effective the means for operating saidselected member after the selecting levers have been operated to selectsaid member, and after said levers have operated the means for actuatingthe illuminating means.

5. In a machine tool of the type described, a luminous board carried bythe machine itself and carrying a diagrammatic illustration of themachine, arrows located on the board near the i1- lustration of themovable members of the machine, means for illuminating said arrows,selecting levers for mechanically selecting a movable member which it isdesired to operate, means for operating said member after it has been soselected, electric switches controlled by said levers for actuating themeans illuminating the arrows corresponding to the selected member, anda con-.

10 not p rt tor ren er ng ec ive h means or operatin said selectedmember a t the s lcq ine. leve shaveb en.- pe ated to e ec sai m: herand after sai lev r ha se rete he lectric swnches for ac uatihst c iluminating means- 6, a mach ne tool of e type des ribed, a lumi o sboardcarr ed by he mac ie tse f nd ca y n a di r mmat c illus ra n the machne, ar ow-s oc ted on he ar hear: he ilustration of the movable membersoi the machine, means for illuminating said arrows, selecting levers,for mechanically selecting a movable member which it is desired tooperate, means for operating said member after it has been so selected,cams carried by said levers, electric switches controlled by said camsfor actuating the means illuminating the arrows corresponding to theselected member, and a control part for rendering effective the meansfor operating said selected member after the selecting lovers have beenoperated to select said member and after said levers have through theircams operated said electric switches to actuate the illuminating means.

7. In a machine tool of the type described, the combination of a frame,an upright on said frame, a tool-carrying carriage adapted to movevertically along said upright, control levers carried by said carriagefor determining which members of said machine are to be operated, andthe direction of operation, means for operating said members, a boardillustrating diagrammatically the various members of the machine,transparent arrows located near the illustration of the differentmovable members of the machine, means for the selective illumination ofsaid arrows, means whereby movement of the control levers controls theilluminating means, and a control part for rendering effective the meansfor operating the members of the machine after the control levers havebeen moved to determine which of said members are to be operated.

8. In a machine tool of the type described, the combination of a frame,an upright on said frame, a tool-carrying carriage adapted to movevertically along said upright, control levers carried by said carriagefor determining which members of said machine are to be operated and thedirection of movement of said members in such operation, a boardillustrating diagrammatically the various members of the machine,transparent arrows located near the illustration of the differentmovable members of the machine, a line sub stantially dividing the boardinto two portions and separating the arrows into two groups corresponding respectively to the movements of said members in eitherdirection, means for the selective illumination of said arrows, meanswhereby movement of the control levers controls the illuminating means,and a control part for rendering effective the means for operating themembers of the machine after the control levers have been moved todetermine which of said members are to be operated.

9. In a machine tool of the type described, the combination of a frame,an upright on said frame, a tool-carrying carriage adapted to movevertically along said upright, control levers carried by said carriagefor determining which members of said machine are to be operated and thedirection of operation, a board illustrating diagrammatically thevarious members of the machine, transparent arrows located near theillustration of the different movable members of the machine, means forthe selective illumination of said arrows, electric circuits connectedto the arrow-il- 1 luminating means and including electric contactsREFERENCES CITED for opening and closing said circuits, cams carried Thefollowing references are of record in the by the control levers forcontrolling said contacts file of this patent: to open and close saidcircuits, whereby the move- 5 ment of the control levers controls theoperation UNITED STATES PATENTS of said illuminating means, and acontrol part 101- Number Name Date rendering effective the means foroperating the 1, 98,128 White Mar. 24, 1931 members of the machine afterthe control levers 2,085,920 McCoy July 6, 1937 have been moved todetermine which of said mem- 10 2,213,959 Garrison et a1 Sept. 10, 1940bars are to be operated. 2,317,472 Merkel Apr. 27, 1943 MARCEL PEGARD 7Lucas May 30, 1944

